using GeoJSON.Net.Geometry;
using System;
using System.Collections.Generic;
using System.Text;
using TurfCS;
using System.Linq;

namespace OnlineUserPool.Unility
{
    public class TurfHelper
    {
        private LineString _line;
        /// <summary>
        /// 
        /// </summary>
        /// <param name="points">坐标(lat,lon)</param>
        public TurfHelper(IEnumerable<double[]> points)
        {
            //var list = new GeoJSON.Net.Geometry.GeographicPosition();
            var list = points.Select(p => new GeoJSON.Net.Geometry.GeographicPosition(p[0], p[1]));

            _line = new LineString(list);
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="distance">km</param>
        public GeographicPosition Along(double distance)
        {
            var pt1 = Turf.Along(_line, distance);
            return ((GeographicPosition)((GeoJSON.Net.Geometry.Point)pt1.Geometry).Coordinates);
            //new LineString()
            //new GeoJSON.Net.Geometry.Point(new GeoJSON.Net.Geometry.GeographicPosition())
            //pt1.BoundingBoxes
        }
    }
}